From an AI generated transcript, it looks like the word "zones" was used. I will wait to more thoroughly check this, in a bit. It will almost certainly resolve YES within a few hours.

I can confirm that Trump said "opportunity zones" at 1:00:54 on this stream:

https://www.youtube.com/live/pf0yVMy_bzc

This will resolve yes now.

Z is a word: "from A to Z", "Z is the last letter of the alphabet", "I wrote a Z".

Z is a semantic unit with a clear meaning, a concrete referent, and an entry in the dictionary. You might spell it Z or zee (both are correct), but there is no sense in which Z is not a word. Your racist British propaganda has no place in a market about an American political debate!

There is a sense in which Z is not a word

Do you mean, if they just say the phoneme /z/?

No. I mean that most people, if asked whether Z is a word, would say “🤨 no, it’s a letter you dufus”. This is strong evidence that many people don’t consider the letter Z to be a word, and thus there is clearly a sense in which it isn’t

Z words were spoken at both 2020 debates (zero, zone)

https://www.debates.org/voter-education/debate-transcripts/september-29-2020-debate-transcript/

https://www.debates.org/voter-education/debate-transcripts/october-22-2020-debate-transcript/

Rules update posted a few minutes after market creation. Nobody but me has traded the market at this time;

EDIT:

This debate is planned to have no audience, but if someone breaks in and shouts the word "Zebra" or something, that will count. Hacking a speaker to say "Zebra" would not though. The word needs to be spoken by a physically present human in the same room as the debaters and moderator (so someone standing outside of the room yelling through a megaphone loud enough to be heard through walls would not count.)